Abstract：During the pretreatment of geological sample by acid dissolution method, there were volatilization loss of boron because boron would form boron trifluoride or boron trichloride in final removal of HF by evaporation either in open or in closed system. As a result, the determination of boron had poor precision. In order to eliminate this kind of volatilization loss, the sample was digested on electric hot plate at 140℃for 2h in closed system by 1mL of HCl, 1mL of HNO3 and 2mL of HF. The removal of HF was not required. The sample solution was diluted to constant volume and directly determined by inductively coupled plasma atomic emission spectrometer which was equipped with HF-resistant injection system. Consequently, a determination method of boron in geochemical survey sample was established. The optimal analysis spectral line for boron was B 249.678nm. The influence of cobalt in sample on the determination results of boron was eliminated by correction with interference equation. When the mass ratio of iron to boron in sample was higher than 14000, the interference of iron could be eliminated by removal of iron with ammonium hydroxide. The experimental results showed that the mass concentration of boron in range of 0.10-2.00μg/mL was linear to the corresponding emission intensity. The correlation coefficient was 0.99993. The detection limit of method was 0.8μg/g. The proposed method was applied for determination of boron in national certified reference materials of soil, stream sediment and rock. The relative standard deviations (RSD, n=12) were 3.5%-9.9%. The relative errors were -13%-8.4%.
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